An air valve, also known as an air release valve, is an indispensable hydraulic accessory widely installed in water supply, sewage, irrigation, chemical and industrial fluid pipelines. Designed to automatically discharge trapped air and vacuum inside pipelines, air valves play a vital role in stabilizing system pressure, eliminating water hammer and extending pipeline service life.
Air valves are generally divided into three common types: single orifice air valves, double orifice air valves and combination air valves. Each type features different functions including large-volume exhaust during pipeline filling, continuous small air venting during normal operation, and automatic air intake to eliminate vacuum pressure during water cut-off. Combination air valves, integrating exhaust, intake and pressure relief functions, have become the most popular type for modern engineering projects.
Constructed with high-strength ductile iron, cast iron or stainless steel, air valve bodies are treated with epoxy anti-corrosion coating to resist rust, oxidation and external erosion. Internal floating balls, rubber seals and moving parts adopt high-quality wear-resistant materials, ensuring bubble-tight sealing and stable performance under long-term continuous operation. Most air valves are manufactured in compliance with DIN, ISO and ANSI standards, supporting PN10, PN16 and PN25 pressure grades.
The working principle of the air valve is simple and reliable. When air accumulates at the pipeline high point, the internal liquid level drops, causing the floating ball to descend and open the exhaust hole to release air. Once the air is completely discharged, the rising water level pushes the float upward to achieve tight sealing. In case of sudden pressure drop or pipeline drainage, the valve automatically inhales air to prevent negative pressure and pipeline collapse.
Air valves possess multiple core advantages. They effectively reduce pipeline vibration and abnormal noise, minimize water hammer damage, improve water transmission efficiency and lower daily maintenance costs. Featuring compact structure, easy installation and maintenance-free operation, these valves are suitable for buried pipelines, outdoor stations and harsh working environments.
With the rapid development of global municipal infrastructure and industrial fluid systems, air valves have become standard pipeline safety accessories. Manufacturers continue to optimize sealing structures and anti-corrosion technologies, providing highly durable, cost-effective and reliable air valve solutions for worldwide water treatment, irrigation and industrial pipeline projects.
Your message must be between 20-3,000 characters!
